Hong Kong has drastically cut carbon monoxide and nitrogen oxide pollution with a world-first scheme to detect and repair vehicles with the highest emissions.
Hong Kong has improved its air quality by using roadside sensors to detect vehicles with the dirtiest fumes and forcing owners to get them fixed.and hydrocarbons. New cars have technology for reducing these emissions, but they can become more polluting over time. Many older cars that are still on the roads are heavy emitters.
To identify the worst-offending vehicles, Hong Kong installed sensors on highway ramps that use infrared and ultraviolet beams to detect carbon monoxide, nitrogen oxide and hydrocarbon levels in tailpipe exhausts of passing vehicles.Cameras capture the licence plates of the most polluting vehicles so their owners can be notified. Owners must repair their vehicles and pass an emissions test, paid for themselves, before their vehicles are allowed back on the road.
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